Chapter 18: Perfusion (Nursing Concepts) Questions and Correct Answers the Latest Update and Recommended Version
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Course
Perfusion
Institution
Perfusion
What is perfusion?
the flow of blood through arteries and capillaries delivering nutrients and oxygen to cells
What does perfusion require?
the heart to generate sufficient cardiac output to transport blood through blood vessels
for distribution in the tissues throughout the body
What is a ...
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✓ amount of blood pumped by the heart each minute
What is central perfusion?
✓ propels blood to all organs and their tissues from arteries through capillaries and returns
the blood to the heart through veins
When does central perfusion begin?
✓ when the heart is stimulated by an electrical impulse that originates from the SA node and
travels to the AV node, then travels through the bundle of His and perkinje fibers in the
myocardium, which in turn causes the ventricles to contract, as the ventricles contract the
mitral and tricuspid valves are forced closed preventing backflow, this forces the aortic
and pulmonic valves to open resulting in ejection of blood into the aorta and pulmonary
arteries
What is normal cardiac output (CO)?
✓ 4 to 6 L/min in adults
What two factors contribute to CO?
✓ stroke volume and heart rate
What is preload?
✓ end diastolic volume in the heart; the amount of blood in the ventricles at the end of
diastole
What is preload influenced by?
✓ stretch capacity of myocardial fibers; amount of blood returned to the heart from the
systemic circulation
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